Department of Computer Science | Institute of Theoretical Computer Science | CADMO

Theory of Combinatorial Algorithms

Prof. Emo Welzl and Prof. Bernd Gärtner

Mittagsseminar (in cooperation with M. Ghaffari, A. Steger and B. Sudakov)

Mittagsseminar Talk Information

Date and Time: Wednesday, June 22, 2011, 12:15 pm

Duration: This information is not available in the database

Location: CAB G51

Speaker: Martin Tancer (Charles Univ.)

Good covers are algorithmically unrecognizable

ood cover in d-dimensional Euclidean space is a finite collection of open sets homeomorphic to a d-ball such that the intersection of any nonempty subcollection is either empty or again homeomorphic to a d-ball. Good covers generalize collections of convex sets and their possible intersection patterns have been intensively studied in terms of necessary conditions.

The main result presented in the talk is that it is actually algorithmically undecidable to recognize whether a given "pattern" is an intersection pattern of a good cover.

Joint work with D. Tonkonog.

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